722edo
| ← 721edo | 722edo | 723edo → |
722 equal divisions of the octave (abbreviated 722edo or 722ed2), also called 722-tone equal temperament (722tet) or 722 equal temperament (722et) when viewed under a regular temperament perspective, is the tuning system that divides the octave into 722 equal parts of about 1.66 ¢ each. Each step represents a frequency ratio of 21/722, or the 722nd root of 2.
722edo is a strong 2.7.19.23 subgroup tuning, with 179\722 being a semiconvergent to the log2(19/16). Despite having a strong approximation of 7, it is only consistent upwards to the 5-limit.
Using the 421\722 fifth, it supports a variant of fifth-stacked tuning that divides 38th harmonic into 9 parts, meaning that C - D# in this system is equal to 19/16, the otonal minor third. This creates a peculiar violation of Western theory which would require spelling this minor triad involving 19/16 as C-D#-G instead of C-Eb-G. This can be realized as 355 & 722 2.17.19.23 temperament from a regular temperament theory perspective - it should be noted that the fifth is not mapped to 3/2 but is slightly flatter.
Aside from this, 722bc val tempers out the hemifamity comma and is a tuning for the undecental temperament. Since 722 is divisible by 19, the 722dg val is a tuning for the kalium temperament in the 19-limit.
Odd harmonics
| Harmonic | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 17 | 19 | 21 | 23 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Error | absolute (¢) | -0.570 | -0.718 | +0.149 | +0.522 | +0.483 | +0.470 | +0.374 | -0.246 | -0.006 | -0.421 | -0.019 |
| relative (%) | -34 | -43 | +9 | +31 | +29 | +28 | +22 | -15 | -0 | -25 | -1 | |
| Steps (reduced) |
1144 (422) |
1676 (232) |
2027 (583) |
2289 (123) |
2498 (332) |
2672 (506) |
2821 (655) |
2951 (63) |
3067 (179) |
3171 (283) |
3266 (378) | |